Drill-chuck.



J. A; DALTON.

A DRILL CHUCK.

vPatented oct.18,19 10.

bsek cling.

dence and State of Rhode Island, have inconcentric head c3 having a'reduced portion 60 vented certainnew and useful Improvements c* to titwithin a second concentric bore in Drill-Chucks, of which the followingis :i formed at the bottom of/the tool-bodv, as at specification. b4,and leave a shouldei` onlsaid head, as 6^", My invention relates to animproved to abut the bottom end face of said body, in structure. in thatclass of tools for holding the manner shown in Figs. 1, 4 and 5. The 65drills; and the objects in view are to s-imhead c3, of the member c, isprovided with a 'plify the structural parts of the chuck, and centralopening c to freely receive the shank to have the body of the tool 4freeto be d1 of the drill CZ. .The spring s surrounds gripped upon to permita drill to be'easily the shank c1 of the support c, the upper endreleased or mounted in position during the of said spring being madefastin said shank, 7.0

UNITED sTATEs PATENT -oEEicE JOSEPH A. DALTON, or rAwTUcxET, EHQDEisLANn, AssiGNoE or ONEHALE To PETER .1. QUIEN, or PAWTUOKET, RHODEISLAND.

DRILL-CHUCK.

Specification of Letters Patent,

Application filed January 6, 1910. Serial No. 536,670.

To all whom it may concern:

Be it known that I, JOSEPH A. DALTON, a citizen of the United States,residing at the city of Pawtucket, in the county of Prov-iievolviiigmovement of the tool in a machine-spindle, of the novel construction,`arrangement, and combination of parts, as

hereinafter described and claimed.

In the accompanying sheet of drawings, Figure 1 represents a sectionalView of a drill-chuck, as constructed in accordance .with my invention.Fig. 2 is a plan section taken on line 2 2. of Fig. 1, showingarrangement of spring connection for the toolbody and its support. Fig,3 is a plan section taken on line 3-.-3 of Fig. 1, showing the camarrangement for forcing rolls into frictional contact upon the shank ofthe drill. -Fi 4 is a side elevation of the fixed support 01'` thetool-body, together with means for releasing the rolls. fromengagement-with the drill-shank, and, Fig. 5. isV a plan. section takenon line 5.,-5. of Fig. 4.

Like reference characters' indicate like parts.

.collar a1.

b is the tool-bodytf of cylindrical form, having a. circular recessformed in its top face, at b1, to receive the stock-collar a1, and saidbody is vprovided with an opening therethrough from said recess, 'the4upper part of said opening being a concentric bore to act'as a chamber,as b, for the rece tiony of-a coilspring s and the lower part o saidopening arranged to dispose three cam faces, as at points L, b, 03 inFig. 3, that form 'hearing surfaces for three rollers r, r, 1'.

c is the support for the'tool-body b, said support having a cylindricalshank c1 which is. reduced in diameter fto form a screwhas three legsc2, c2, c2 divided equidistantly apart throughout the circle of saidsupport, depending from the Shank c1 of-the latter, and which legsterminate iyith an e'iilarged as at a. p ointl s1 in Fig. 2, While thelower end of said spring is made fastin the'toolbody as'` ata pointsV2in said figure. The tool-body?) is loose between the stock-collar al andhead c3 of the fixed support c, and the 7 legs c2 of the latter aredesigned to fit-dietween the friction rollers r. The surface 'of' thecams b3- `extend from ythe'concentric' bore b4 of the tool-body b to apoint near to and below the shank o1 of the support c. 8 Assuming thetool to be mounted in a machine-spindle and to revolve continuously7 iiithe direction indicated by the arrow: Yi hen desired toV insertv a drillthe operator grasps the body Zi With'a hold suilicient tocause a 8contract-ing of the spring s and at the same time permit the rollers rto move to theirlowest position on the cam surfaces ZJ?, when the shankdi of the drill may then be'readily inserted within the support c, afterwhich the .9 operator releases his grasp upon the body b when theexpanding action of the spring then causes t e rollers 'r to move alongthe" increase of rise; of thecams and into firm frictional contact u onthe surfaceof-the 9 drill-shank. Therefgre, by having the-toolbody Z)free to grasp upon and turn against the tension of the spring .s permitsa drill to be readily inserted and held ine4 rigid position during therevolution ofthe tool. .1

. What I claim and desire to secure by Let.-

which is provided with a screwthreaded 4105 aperture; a bodyrhaving a.circula-r recess to" receive 'the stock-collar and said body having anopening extending from its recess, the

upper part of said opening in the forni of a f' threaded portion c2 toengage in a threaded circular chamber, and the lower part 'of said 110aperture of they stock-collar a1, said support opening arranged. todsposl three cam bea ring surfaces; :n cylinlllriul roller mounted.1111193011 Scam surface; a, cylindrical sup )orb ing melnbQr 11a-vingshank which is'redlucd 'in the' threaded aperture of the stock-coH'zu',mud* member ,haring three'legsdependmg from its shank und which logs;terminat' with n circular head having: a reduced .porofton o'fit a boreformed in the, front face of thl tool-body, yand said member provided.with an vopening' formed in -its 3head Vt'o re- 'smd spring having onoom! ulm'vlwd to thu latter and ts otlwr 0nd ntun'lwd to Huid fm1]- body.v

in presence of two witnesses.

JOSEPH DALTON; i hwssvs T. IIANxmIAy PETER J. QMNN.

